


*{
    padding:0;
    margin: 0;
    list-style: none;
    text-decoration: none;
    box-sizing: border-box;
}

.box{
    width: 402px;
    height: 300px;
    border:1px solid #CCCC;
    margin: 20px auto 0;
}

nav{
    height: 100%;
    width: 80px;
    border-right: 1px solid #CCC;
    line-height: 44px;
    float: left;
}

nav span{
    display: block;
    text-align: center;
    border-bottom: 1px solid #CCC;
}
/* :not(选择器) 除了某个元素之外的所有元素 */
/* nav span:not(:last-child){
    border-right: 1px solid #CCC;
} */

.active{
    background: orangered;
    color: #FFF;
    font-weight: 900;
}
.cons{
    width: 320px;
    float: left;
    padding: 10px;
    line-height: 40px;
}

